The grassland carbon cycle:Mechanisms,responses to global changes,and potential contribution to carbon neutrality  

作　　者：Lingli Liu Emma J.Sayer Meifeng Deng Ping Li Weixing Liu Xin Wang Sen Yang Junsheng Huang Jie Luo Yanjun Su JoséM.Grünzweig Lin Jiang Shuijin Hu Shilong Piao 

机构地区：[1]State Key Laboratory of Vegetation and Environmental Change,Institute of Botany,Chinese Academy of Sciences,Beijing 100093,China [2]University of Chinese Academy of Sciences,Beijing 100049,China [3]Lancaster Environment Centre,Lancaster University,Lancaster LA14YQ,United Kingdom [4]Department of Evolutionary Biology and Environmental Studies,University of Zurich,Zurich 8057,Switzerland [5]Institute of Plant Sciences and Genetics in Agriculture,The Robert H.Smith Faculty of Agriculture,Food and Environment,The Hebrew University of Jerusalem,Rehovot 7610001,Israel [6]School of Biological Sciences,Georgia Institute of Technology,310 Ferst Drive,Atlanta,GA 30332,United States [7]Department of Plant Pathology,North Carolina State University,Raleigh,NC 27607,United States [8]Sino-French Institute for Earth System Science,College of Urban and Environmental Science,Peking University,Beijing 100871,China [9]National Hulunber Grassland Ecosystem Observation and Research Station,Institute of Agricultural Resources and Regional Planning,Chinese Academy of Agricultural Sciences,Beijing 100081,China

出　　处：《Fundamental Research》2023年第2期209-218,共10页自然科学基础研究（英文版）

基　　金：supported by the National Natural Science Foundation of China (32125025 and 31988102);the Strategic Priority Research Program of the Chinese Academy of Sciences (XDA23080301 and XDA26010303);JMG acknowledges the support of the Israel Science Foundation (1796/19).

摘　　要：Grassland is one of the largest terrestrial biomes,providing critical ecosystem services such as food production,biodiversity conservation,and climate change mitigation.Global climate change and land-use intensification have been causing grassland degradation and desertification worldwide.As one of the primary medium for ecosystem energy flow and biogeochemical cycling,grassland carbon(C)cycling is the most fundamental process for maintaining ecosystem services.In this review,we first summarize recent advances in our understanding of the mechanisms underpinning spatial and temporal patterns of the grassland C cycle,discuss the importance of grasslands in regulating inter-and intra-annual variations in global C fluxes,and explore the previously unappreciated complexity in abiotic processes controlling the grassland C balance,including soil inorganic C accumulation,photochemical and thermal degradation,and wind erosion.We also discuss how climate and land-use changes could alter the grassland C balance by modifying the water budget,nutrient cycling and additional plant and soil processes.Further,we examine why and how increasing aridity and improper land use may induce significant losses in grassland C stocks.Finally,we identify several priorities for future grassland C research,including improving understanding of abiotic processes in the grassland C cycle,strengthening monitoring of grassland C dynamics by integrating ground inventory,flux monitoring,and modern remote sensing techniques,and selecting appropriate plant species combinations with suitable traits and strong resistance to climate fluctuations,which would help design sustainable grassland restoration strategies in a changing climate.

关 键 词：Climate changes Land-use change Soil Biotic and abiotic interactions Grassland degradation Grassland restoration Carbon accounting Carbon storage and sequestration mechanisms 

分 类 号：S81[农业科学—畜牧学]